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HI Guys,
We've just done a fuel economy rally in our 2000 Insight rally car and HCH rally car. (see www.oaktechybrid.co.uk for pics and details.)
Before the rally we did some mods to the car which is a Jap import CVT which perceived wisdom says should be lean burn.
First up we repositioned the MIMA controller to a little plinth mounted on top of the instrument pod to allow easy access to the manual control joystick. (we have a PIMA setting for speed competition work ) 3 years of motorsport using PIMA have given this car an amazingly fit set of batteries!
Next we did some aero and suspension work checking all the alignments and replacing the very harsh competition front struts with a standard set. The car still has its stiff rear end and poly bushes etc. We backed off the rear shoes to eliminate any drag. On the aero front we made a dam to cover the lower front intake and tidied up the under side by extending the tray over the fuel tank and rear beam and screwing up the leading edge of the rear bumper to the floor of the car which otherwise hangs down as a big air scoop.

We fitted a set of Pirelli low drag tyres and put in 60psi.

Our next job was to blank off 75% of the radiator and fit a very neat curved intake pipe from the airbox to just behind the open part of the rad to pick up the warm air flowing through.
It's cold here at the moment and driving the car hard shows very little temp increase on the gauge. This pipe is trumpeted at the intake end the idea being to use this warm air to stimulate the lean burn.
This rally, run by Ilkley Motor Club, has run each year for over 40 years and covered a timed course of 55 miles of very tough single track rural and hill roads in the Yorkshire Dales plus some urban driving through the towns on route.
The result for the Insight was 81.3 mpg on the rally which was easily a new record for the event and 17 mpg better than the next best car a little Renault Clio Diesel. Our Civic Hybrid which also competed managed 52mpg.

On the 60 mile drive to the event however we measured the Insight at 98.9 mpg at a 42mph average over quite hilly 'A' roads and the Civic at 63 mpg at an average of 48mph.
 

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Great Job. Good pictures also.
That makes you qualified for the HYBRIDFEST 2009.
I managed 86.7 mpg with the "Little Red Rocket" at the Hybridfest in 2007, and had the fastest time for the course. :roll:
I would like to see an "economy" run of at least 500 miles.

Willie
 

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Well done Paul :D

Nice to chat on the phone, don't forget to pop round after I get back from hols. I hope to get Lithium install done asap when I get back on 011208.
 

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Discussion Starter #4
Hi Willie, Is there a website for Hybidfest? I guess it's in the US but you never know we might just get a scheme together to come over.

Peter, I'll contact you when you're back from hols & pop over.

Mike D, this was the first time we've used the MIMA for its original purpose. Great piece of kit !!
 

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Paul, if you use the Google search function (Web sites) and type in Hybridfest. You can view all the information. 8)


Willie
 

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Hi Paul,
That's great that you guys have run some fuel economy test with your CVT and MIMA. Can you elaborate on how you used MIMA to improve the CVT MPG, and a guess as to how much it helped compared to the stock?

Many CVT owners have been asking those questions, and with only 3 CVT'S with MIMA, I do not have a lot of information to share with them. ;)
Also can you give us the Pirelli tire model number, as we are finding that the Bridgestone's are difficult to get.
 

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Discussion Starter #8
Hi Mike,
we used MIMA in what I guess is the conventional way. We manually powered up the hills and away from junctions at very light throttle loads and then manually applied maximum regen on the down hill bits when we needed to slow the car down. It is hard to be precise as to what percentage benefit we gained from using the MIMA as we had other mods on the car but I would guess we got well over 15% better fuel efficiency.

But I can tell you that MIMA + CVT is a great combo.Getting more work from the batteries gives our MIMA CVT car much stronger performance than its non MIMA sister that we use as a road car. I'll let Peter have a go in the rally car when I go over to see him in the next few weeks so he can give a second opinion.

see this link for more. http://www.green-car-guide.com/articles ... Page1.html
 

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Ditto Paul and a Manual Mima Car. I look forward to trying the CVT.

The Manual MIMA car in second gear with a full battery gives quite a few cars a scare upto the redline at 70mph+ :D

I'm away on hols in italy at present but am itching to finish my lithium install!
 

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Hi,

Great article.

I don't have MIMA (yet). Might yet need a new battery first.

With the standard set up accelerating in drive causes the CVT to lower the ratio unless you are very gentle (and drop out of lean burn if you are heavy footed). I have found that at high speed the CVT can't lower the ratio much so bungs in lots of electricity, a bit like flooring the accelerator in a high gear at low revs in a manual car. I surmise from your replies and my own experience that MIMA allows the driver to apply the electric power without moving the throttle so in "Drive" the CVT will stay in the highest possible ratio. This may explain why CVT cars generaly don't do as good mpg as manuals. A potential 15% improvement seems a very good incentive for fitting MIMA.

From the articles it sounds as though you keep it in Drive. Apart from the obvious higher revs at low speed, have you made any performance comparisons between Drive and Sport modes?
 

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Discussion Starter #13
Hi Ccaptain,

We did some performance data logging of sport vs drive and found a definite advantage in acceleration using sport. We always use sport on rallies if we remember to select it at the start of the stage. If your batteries are still ok you may find that MIMA will rejuvenate them. This certainly happened with our car. Apparently working the batteries very hard can change the structure of their crystals allowing them more contact surface area and more efficiency. Or so a boffin told me. Our 8 year old batteries are much better now than when we first rallied the car.
 

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More interesting feedback on the batterys and heavy use. I am still running on my 8 year old batteries, and am nearing 150K, during all that time I have never had a recalibration. The pack still runs from top to bottom, and seems to have the same capacity as when they were new.Further evidence that the cells and pack balance respond well to heavy use, once the pack is in balance. ;)
 
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